/* $NetBSD: pte.h,v 1.12 1995/07/05 17:53:41 pk Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)pte.h 8.1 (Berkeley) 6/11/93 */ /* * Sun-4 (sort of) and 4c (SparcStation) Page Table Entries * (Sun call them `Page Map Entries'). */ #ifndef LOCORE /* * Segment maps contain `pmeg' (Page Map Entry Group) numbers. * A PMEG is simply an index that names a group of 32 (sun4) or * 64 (sun4c) PTEs. * Depending on the CPU model, we need 7 (sun4c) to 10 (sun4/400) bits * to hold the hardware MMU resource number. */ typedef u_short pmeg_t; /* 10 bits needed per Sun-4 segmap entry */ /* * Region maps contain `smeg' (Segment Entry Group) numbers. * An SMEG is simply an index that names a group of 64 PMEGs. */ typedef u_char smeg_t; /* 8 bits needed per Sun-4 regmap entry */ #endif /* * Address translation works as follows: * * (for sun4c and 2-level sun4) * 1. test va<31:29> -- these must be 000 or 111 (or you get a fault) * 2. concatenate context_reg<2:0> and va<29:18> to get a 15 bit number; * use this to index the segment maps, yielding a 7 or 9 bit value. * (for 3-level sun4) * 1. concatenate context_reg<3:0> and va<31:24> to get a 8 bit number; * use this to index the region maps, yielding a 10 bit value. * 2. take the value from (1) above and concatenate va<17:12> to * get a `segment map entry' index. This gives a 9 bit value. * (for sun4c) * 3. take the value from (2) above and concatenate va<17:12> to * get a `page map entry' index. This gives a 32-bit PTE. * (for sun4) * 3. take the value from (2 or 3) above and concatenate va<17:13> to * get a `page map entry' index. This gives a 32-bit PTE. * * In other words: * * struct sun4_3_levelmmu_virtual_addr { * u_int va_reg:8, (virtual region) * va_seg:6, (virtual segment) * va_pg:5, (virtual page within segment) * va_off:13; (offset within page) * }; * struct sun4_virtual_addr { * u_int :2, (required to be the same as bit 29) * va_seg:12, (virtual segment) * va_pg:5, (virtual page within segment) * va_off:13; (offset within page) * }; * struct sun4c_virtual_addr { * u_int :2, (required to be the same as bit 29) * va_seg:12, (virtual segment) * va_pg:6, (virtual page within segment) * va_off:12; (offset within page) * }; * * Then, given any `va': * * extern smeg_t regmap[16][1<<8]; (3-level MMU only) * extern pmeg_t segmap[8][1<<12]; ([16][1<<12] for sun4) * extern int ptetable[128][1<<6]; ([512][1<<5] for sun4) * * (the above being in the hardware, accessed as Alternate Address Spaces) * * if (mmu_3l) * physreg = regmap[curr_ctx][va.va_reg]; * physseg = segmap[physreg][va.va_seg]; * else * physseg = segmap[curr_ctx][va.va_seg]; * pte = ptetable[physseg][va.va_pg]; * if (!(pte & PG_V)) TRAP(); * if (writing && !pte.pg_w) TRAP(); * if (usermode && pte.pg_s) TRAP(); * if (pte & PG_NC) DO_NOT_USE_CACHE_FOR_THIS_ACCESS(); * pte |= PG_U; (mark used/accessed) * if (writing) pte |= PG_M; (mark modified) * ptetable[physseg][va.va_pg] = pte; * physadr = ((pte & PG_PFNUM) << PGSHIFT) | va.va_off; */ #if defined(MMU_3L) && !defined(SUN4) #error "configuration error" #endif #if defined(MMU_3L) extern int mmu_3l; #endif #define NBPRG (1 << 24) /* bytes per region */ #define RGSHIFT 24 /* log2(NBPRG) */ #define RGOFSET (NBPRG - 1) /* mask for region offset */ #define NSEGRG (NBPRG / NBPSG) /* segments per region */ #define NBPSG (1 << 18) /* bytes per segment */ #define SGSHIFT 18 /* log2(NBPSG) */ #define SGOFSET (NBPSG - 1) /* mask for segment offset */ /* number of PTEs that map one segment (not number that fit in one segment!) */ #if defined(SUN4) && defined(SUN4C) extern int nptesg; #define NPTESG nptesg /* (which someone will have to initialize) */ #else #define NPTESG (NBPSG / NBPG) #endif /* virtual address to virtual region number */ #define VA_VREG(va) (((unsigned int)(va) >> RGSHIFT) & 255) /* virtual address to virtual segment number */ #define VA_VSEG(va) (((unsigned int)(va) >> SGSHIFT) & 63) /* virtual address to virtual page number, for Sun-4 and Sun-4c */ #define VA_SUN4_VPG(va) (((int)(va) >> 13) & 31) #define VA_SUN4C_VPG(va) (((int)(va) >> 12) & 63) /* truncate virtual address to region base */ #define VA_ROUNDDOWNTOREG(va) ((int)(va) & ~RGOFSET) /* truncate virtual address to segment base */ #define VA_ROUNDDOWNTOSEG(va) ((int)(va) & ~SGOFSET) /* virtual segment to virtual address (must sign extend on holy MMUs!) */ #if defined(MMU_3L) #define VRTOVA(vr) (mmu_3l \ ? ((int)(vr) << RGSHIFT) \ : (((int)(vr) << (RGSHIFT+2)) >> 2)) #define VSTOVA(vr,vs) (mmu_3l \ ? (((int)vr << RGSHIFT) + ((int)vs << SGSHIFT)) \ : ((((int)vr << (RGSHIFT+2)) >> 2) + ((int)vs << SGSHIFT))) #else #define VRTOVA(vr) (((int)vr << (RGSHIFT+2)) >> 2) #define VSTOVA(vr,vs) ((((int)vr << (RGSHIFT+2)) >> 2) + ((int)vs << SGSHIFT)) #endif extern int mmu_has_hole; #define VA_INHOLE(va) (mmu_has_hole \ ? ( (unsigned int)(((int)(va) >> PG_VSHIFT) + 1) > 1) \ : 0) /* Define the virtual address space hole */ #define MMU_HOLE_START 0x20000000 #define MMU_HOLE_END 0xe0000000 #if defined(SUN4) && defined(SUN4C) #define VA_VPG(va) (cputyp==CPU_SUN4C ? VA_SUN4C_VPG(va) : VA_SUN4_VPG(va)) #endif #if defined(SUN4C) && !defined(SUN4) #define VA_VPG(va) VA_SUN4C_VPG(va) #endif #if !defined(SUN4C) && defined(SUN4) #define VA_VPG(va) VA_SUN4_VPG(va) #endif /* there is no `struct pte'; we just use `int' */ #define PG_V 0x80000000 #define PG_PROT 0x60000000 /* both protection bits */ #define PG_W 0x40000000 /* allowed to write */ #define PG_S 0x20000000 /* supervisor only */ #define PG_NC 0x10000000 /* non-cacheable */ #define PG_TYPE 0x0c000000 /* both type bits */ #define PG_OBMEM 0x00000000 /* on board memory */ #define PG_OBIO 0x04000000 /* on board I/O (incl. Sbus on 4c) */ #ifdef SUN4 #define PG_VME16 0x08000000 /* 16-bit-data VME space */ #define PG_VME32 0x0c000000 /* 32-bit-data VME space */ #endif #define PG_U 0x02000000 #define PG_M 0x01000000 #define PG_IOC 0x00800000 /* IO-cacheable */ #define PG_MBZ 0x00780000 /* unused; must be zero (oh really?) */ #define PG_PFNUM 0x0007ffff /* n.b.: only 16 bits on sun4c */ #define PG_TNC_SHIFT 26 /* shift to get PG_TYPE + PG_NC */ #define PG_M_SHIFT 24 /* shift to get PG_M, PG_U */ /*efine PG_NOACC 0 ** XXX */ #define PG_KR 0x20000000 #define PG_KW 0x60000000 #define PG_URKR 0 #define PG_UW 0x40000000 #ifdef KGDB /* but we will define one for gdb anyway */ struct pte { u_int pg_v:1, pg_w:1, pg_s:1, pg_nc:1; enum pgtype { pg_obmem, pg_obio, pg_vme16, pg_vme32 } pg_type:2; u_int pg_u:1, pg_m:1, pg_mbz:5, pg_pfnum:19; }; #endif /* * These are needed in the register window code * to check the validity of (ostensible) user stack PTEs. */ #define PG_VSHIFT 29 /* (va>>vshift)==0 or -1 => valid */ /* XXX fix this name, it is a va shift not a pte bit shift! */ #define PG_PROTSHIFT 29 #define PG_PROTUWRITE 6 /* PG_V,PG_W,!PG_S */ #define PG_PROTUREAD 4 /* PG_V,!PG_W,!PG_S */ /* static __inline int PG_VALID(void *va) { register int t = va; t >>= PG_VSHIFT; return (t == 0 || t == -1); } */ #if defined(SUN4M) /* * Reference MMU PTE bits. */ #define SRPTE_PPN_MASK 0x07ffff00 #define SRPTE_PPN_SHIFT 8 #define SRPTE_CACHEABLE 0x00000080 /* Page is cacheable */ #define SRPTE_MOD 0x00000040 /* Page is modified */ #define SRPTE_REF 0x00000020 /* Page is referenced */ #define SRPTE_ACCMASK 0x0000001c /* Access rights mask */ #define SRPTE_ACCSHIFT 2 /* Access rights shift */ #define SRPTE_TYPEMASK 0x00000003 /* PTE Type */ #define SRPTE_PTE 0x00000002 /* A PTE (Page Table Entry) */ #define SRPTE_PTP 0x00000001 /* A PTP (Page Table Pointer) */ /* * Reference MMU access permission bits. * format: SRACC_sssuuu, * where denote the supervisor rights * and denote the user rights */ #define SRACC_R__R__ 0 #define SRACC_RW_RW_ 1 #define SRACC_R_XR_X 2 #define SRACC_RWXRWX 3 #define SRACC___X__X 4 #define SRACC_RW_R__ 5 #define SRACC_R_X___ 6 #define SRACC_RWX___ 7 /* * IOMMU PTE bits. */ #define IOPTE_PPN_MASK 0x07ffff00 #define IOPTE_PPN_SHIFT 8 #define IOPTE_RSVD 0x000000f1 #define IOPTE_WRITE 0x00000004 #define IOPTE_VALID 0x00000002 #endif /* SUN4M */